For a culture dominated by those who claim to believe in evolution, we're doing a pretty good job of eliminating the natural selection factor. First we get rid of the dangerous toys (pocket knives, BB guns, lawn darts, etc.) that used to remove stupid kids from the gene pool, then we get rid of rough sports. I suppose next some liberal in a position of power will point to a jail cell and say, "If you get in there, it will be much easier to protect you."
That's an interesting idea; survival of the educationally fittest, in essence, based on the "evolution" of the educational system, when in reality, it has been the devolution of the educational system. But who are the fittest? Many will come from home schooling!
It's already happened, the welfare system.